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Steam at 373 K is passed through a tube ...

Steam at 373 K is passed through a tube of radius 10 cm and length 2 m. The thickness of the tube is 5 mm and thermal conductivity of the material is 390 `W m^(-1) K^(-1). The outside temperature is 0C. The heat lost per second in J is

A

`98 xx 10^5J`

B

`9.8 xx 10^5 J`

C

`89 xx 10^4J`

D

`98 xx 10^4J`

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